drm/i915/color: Fix typo for Plane CSC indexes

commit 2efc8e10 upstream.

Replace _PLANE_INPUT_CSC_RY_GY_2_* with _PLANE_CSC_RY_GY_2_*
for Plane CSC

Fixes: 6eba56f6

 ("drm/i915/pxp: black pixels on pxp disabled")

Cc: <stable@vger.kernel.org>

Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Animesh Manna <animesh.manna@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230330150104.2923519-1-chaitanya.kumar.borah@intel.com
(cherry picked from commit e39c76b2

)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>